Question 1

In the colloid known as mayonnaise, the dispersed phase is _____ .

Accepted Answer

In mayonnaise, the dispersed phase is a liquid. Mayonnaise is an example of an emulsion, which is a mixture of two immiscible liquids where one is dispersed in the other. In this case, oil droplets are dispersed in water or vinegar, with egg yolk acting as an emulsifier to stabilize the mixture.

Question 2

A 0.9% NaCl (w\w)solution in water is

Accepted Answer

A 0.9% NaCl solution in water is hypertonic compared to pure water, leading to an elevation in boiling point due to the colligative properties of solutions. This means it will boil at or above 100°C, unlike pure water which boils exactly at 100°C under standard atmospheric pressure.

Question 3

What volume of ethyl alcohol is contained in 35 mL (1 oz.)of 86 proof liquor, which is 43% (v\v)alcohol?

Accepted Answer

The volume of ethyl alcohol in 35 mL of 86 proof liquor, which is 43% (v/v) alcohol, is calculated as 35 mL * 0.43 = 15.05 mL, which rounds to approximately 15 mL.

Question 4

The vapor pressure of a pure solvent is

Accepted Answer

The vapor pressure of a pure solvent is higher than that of a solution because the presence of a solute decreases the number of solvent molecules at the surface available to escape into the vapor phase, thus lowering the vapor pressure.

Question 5

The boiling point of a solution of sugar water is

Accepted Answer

Adding sugar to water increases the boiling point of the solution compared to the pure solvent due to the colligative property known as boiling point elevation.

Question 6

What is the underlying process involved in dialysis?

Accepted Answer

Dialysis works on the principle of osmosis, where the movement of solutes occurs from an area of higher concentration to an area of lower concentration across a semipermeable membrane to cleanse the blood.

Question 7

What is the osmotic pressure of a 0.050 M solution of AlCl₃ in water that is at 0.00 ° C? Consider AlCl₃ to be a strong electrolyte.

Accepted Answer

The answer of What is the osmotic pressure of a...

Question 8

Which of the following pairs correctly represent similar functions for a solution component and a colloid component?

Accepted Answer

In a solution, the solvent is the medium in which the solute is dissolved, similar to the dispersion medium in a colloid, which is the medium in which the dispersed phase is distributed.

Question 9

Which of the following tend to stabilize colloids and prevent suspended particles from settling?

Accepted Answer

Both the presence of emulsifying agents and the absorption of charges by colloid particles help stabilize colloids by preventing the suspended particles from settling. Emulsifying agents can help stabilize the mixture of two immiscible liquids, and the absorption of charges prevents the particles from coalescing by providing a repulsive force.

Question 10

An isotonic salt solution is 0.90% (w\w)NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?

Accepted Answer

An isotonic salt solution that is 0.90% (w/w) NaCl means that there are 0.90 grams of NaCl in every 100 grams of solution. Therefore, in 1.00 kg (or 1000 grams) of solution, there would be 9.0 grams of NaCl.

Question 11

Changes in boiling point, freezing point, and vapor pressure are

Accepted Answer

The changes in colligative properties depend on the number of solute particles. Both solutions have the same molarity and volume, leading to the same number of solute particles.

Question 12

Calculate the number of moles of ZnCl, in 100 mL of 0.300 M solution.

Accepted Answer

The number of moles of ZnCl2 in 100 mL (0.1 L) of a 0.300 M solution is calculated using the formula: moles = molarity × volume (in liters). Therefore, moles = 0.300 M × 0.1 L = 0.030 moles, which is represented as 3.00 × 10^(-2) in scientific notation.

Question 13

Which of the following pass through both osmotic and dialysis membranes?

Accepted Answer

Solvent molecules can pass through both osmotic and dialysis membranes. Osmotic membranes allow the passage of solvent molecules (typically water) but restrict solutes, while dialysis membranes permit the diffusion of small molecules and ions but block larger molecules.

Question 14

Two solutions with concentrations of 2% sugar and 4% sugar, respectively, are separated by a semipermeable membrane. During osmosis, there is a net flow of

Accepted Answer

During osmosis, water molecules move from the solution with a lower concentration of solute (in this case, sugar) to the solution with a higher concentration of solute, across a semipermeable membrane. This means water moves from the 2% sugar solution to the 4% sugar solution.

Question 15

The spores from many molds produce an allergic reaction in many individuals. If mold spores in the air were to be considered a colloid, which technique would remove the spores best from a functioning air conditioner duct?

Accepted Answer

An electrical device with both positive and negative poles can effectively remove colloidal particles like mold spores from the air by charging them and causing them to be attracted to oppositely charged plates, thus removing them from the air stream.

Question 16

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: K_f for water is 1.86°C\M.)

Accepted Answer

The freezing point depression can be calculated using the formula ΔTf = i * Kf * m, where i is the van't Hoff factor (2 for KCl), Kf is the freezing point depression constant (1.86°C/m for water), and m is the molality. First, calculate the molality: moles of KCl = 4.66 g / 74.55 g/mol = 0.0625 mol; molality = 0.0625 mol / 0.250 kg = 0.25 m. Then, ΔTf = 2 * 1.86°C/m * 0.25 m = 0.930°C. Thus, the solution's freezing point is 0.930°C lower than pure water.

Question 17

The rate of osmosis

Accepted Answer

The answer of The rate of osmosis
...

Question 18

Compared to pure water, a salt water solution will have a

Accepted Answer

Adding salt to water lowers its vapor pressure and freezing point but raises its boiling point due to colligative properties.

Question 19

How many mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution?

Accepted Answer

The correct answer is D.To prepare 1500 mL of 0.200 M HCl solution, we need to use the formula:M1V1 = M2V2where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.We know that M1 = 6.00 M, V2 = 1500 mL, and M2 = 0.200 M. We can solve for V1:V1 = (M2V2) / M1 = (0.200 M * 1500 mL) / 6.00 M = 50.0 mLTherefore, we need to use 50.0 mL of 6.00 M HCl to prepare 1500 mL of 0.200 M HCl solution.

Question 20

A solution is prepared by adding 25.0 mL of 1.30 M AlCl₃ solution to a flask, and then adding enough water to give a final volume of 200.0 mL. What is the molarity of the solution?

Accepted Answer

The molarity of the solution is found using the dilution formula $M_1V_1 = M_2V_2$, where $M_1$ and $V_1$ are the molarity and volume of the initial solution, and $M_2$ and $V_2$ are the molarity and volume of the final solution. Substituting the given values, $1.30 \, \text{M} \times 25.0 \, \text{mL} = M_2 \times 200.0 \, \text{mL}$. Solving for $M_2$ gives $M_2 = 0.163 \, \text{M}$.

Quiz 7: Solutions and Colloids

In the colloid known as mayonnaise, the dispersed phase is _____ .

A 0.9% NaCl (w\w) solution in water is

What volume of ethyl alcohol is contained in 35 mL (1 oz.) of 86 proof liquor, which is 43% (v\v) alcohol?

The vapor pressure of a pure solvent is

The boiling point of a solution of sugar water is

What is the underlying process involved in dialysis?

What is the osmotic pressure of a 0.050 M solution of AlCl₃ in water that is at 0.00 ° C? Consider AlCl₃ to be a strong electrolyte.

Which of the following pairs correctly represent similar functions for a solution component and a colloid component?

Which of the following tend to stabilize colloids and prevent suspended particles from settling?

An isotonic salt solution is 0.90% (w\w) NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?

Changes in boiling point, freezing point, and vapor pressure are

Calculate the number of moles of ZnCl, in 100 mL of 0.300 M solution.

Which of the following pass through both osmotic and dialysis membranes?

Two solutions with concentrations of 2% sugar and 4% sugar, respectively, are separated by a semipermeable membrane. During osmosis, there is a net flow of

The spores from many molds produce an allergic reaction in many individuals. If mold spores in the air were to be considered a colloid, which technique would remove the spores best from a functioning air conditioner duct?

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: K_f for water is 1.86°C\M.)

The rate of osmosis

Compared to pure water, a salt water solution will have a

How many mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution?

A solution is prepared by adding 25.0 mL of 1.30 M AlCl₃ solution to a flask, and then adding enough water to give a final volume of 200.0 mL. What is the molarity of the solution?

Quiz 7: Solutions and Colloids

In the colloid known as mayonnaise, the dispersed phase is _____ .

A 0.9% NaCl (w\w) solution in water is

What volume of ethyl alcohol is contained in 35 mL (1 oz.) of 86 proof liquor, which is 43% (v\v) alcohol?

The vapor pressure of a pure solvent is

The boiling point of a solution of sugar water is

What is the underlying process involved in dialysis?

What is the osmotic pressure of a 0.050 M solution of AlCl3 in water that is at 0.00 ° C? Consider AlCl3 to be a strong electrolyte.

Which of the following pairs correctly represent similar functions for a solution component and a colloid component?

Which of the following tend to stabilize colloids and prevent suspended particles from settling?

An isotonic salt solution is 0.90% (w\w) NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?

Changes in boiling point, freezing point, and vapor pressure are

Calculate the number of moles of ZnCl, in 100 mL of 0.300 M solution.

Which of the following pass through both osmotic and dialysis membranes?

Two solutions with concentrations of 2% sugar and 4% sugar, respectively, are separated by a semipermeable membrane. During osmosis, there is a net flow of

The spores from many molds produce an allergic reaction in many individuals. If mold spores in the air were to be considered a colloid, which technique would remove the spores best from a functioning air conditioner duct?

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: Kf for water is 1.86°C\M.)

The rate of osmosis

Compared to pure water, a salt water solution will have a

How many mL of 6.00 M HCl are needed to prepare 1500 mL of 0.200 M HCl solution?

A solution is prepared by adding 25.0 mL of 1.30 M AlCl3 solution to a flask, and then adding enough water to give a final volume of 200.0 mL. What is the molarity of the solution?

What is the osmotic pressure of a 0.050 M solution of AlCl₃ in water that is at 0.00 ° C? Consider AlCl₃ to be a strong electrolyte.

A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water? (Note: K_f for water is 1.86°C\M.)

A solution is prepared by adding 25.0 mL of 1.30 M AlCl₃ solution to a flask, and then adding enough water to give a final volume of 200.0 mL. What is the molarity of the solution?